【摘要】 为研究普光天然气管道悬索桥动力性能,完成了在天津波作用下的单向和三向一致激励地震时程反应计算。结果表明,在横向地震波激励下,普光天然气管道悬索桥的地震响应主要表现为桥身的横漂和桥塔的横桥向振动,顺桥向和竖向振动效应很小。在顺桥向地震波激励下,悬索桥的各个部位的位移和应力都明显比横桥向地震波激励下的位移小。在竖向地震波激励下,悬索桥的地震响应主要表现为桥身和桥塔的竖向振动,顺桥向和横桥向振动效应很小。对于桥身结构,横桥向的地震波所产生的震害最大,其次为竖向的地震波,顺桥向的地震波所产生的震害最小。对于主塔结构,顺桥向地震波激励下其位移时程曲线波动最大,但顺桥向地震波激励下的主塔应力时程曲线低于横桥向的地震波激励下的应力时程曲线。更多还原

【Abstract】 Seismic time-history response of cable-suspended bridge used for natural gas pipelines under the single and multiple support excitations were calculated in order to research the dynamic property of the cable-suspended bridge.Under the crosswise seismic wave excitation,the main seismic response of cable-suspended bridge used for natural gas pipelines show crosswise drift of the bridge deck and crosswise vibration of the bridge tower,the vertical vibration and vibration effect along the bridge is insignificant.Under the seismic wave excitation along the bridge,the displacement and stress of parts of the cable-suspended bridge are significantly smaller than those of parts of the bridge under the crosswise seismic wave excitation.Under the vertical seismic wave excitation,the main seismic response of cable-suspended bridge shows the vertical vibration of the bridge and bridge tower,the crosswise and longitudinal bridge effect are insignificant.For bridge deck structure,the crosswise seismic wave cause the largest seismic damage,the vertical seismic wave follows,the seismic wave along the bridge cause the minimum seismic damage.For main bridge tower structure,the displacement time-history curve show the greatest volatility under the seismic wave excitation along the bridge,but the stress time-history curve is lower than the curve under the crosswise seismic waveexcitation curve.更多还原